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#include "texture.h"
static int honey_lua_texture_new(lua_State* L)
{
honey_texture* texture = lua_newuserdata(L, sizeof(honey_texture));
return 1;
}
static int honey_lua_texture_create(lua_State* L)
{
honey_texture* texture;
int width, height;
char* type;
honey_lua_parse_arguments(L, 4,
HONEY_USERDATA, &texture,
HONEY_STRING, &type,
HONEY_INTEGER, &width,
HONEY_INTEGER, &height);
if (strcmp(type, "greyscale") == 0)
honey_texture_new_greyscale(texture, width, height, NULL);
else if (strcmp(type, "rgb") == 0)
honey_texture_new_rgb(texture, width, height, NULL);
else if (strcmp(type, "rgba") == 0)
honey_texture_new_rgba(texture, width, height, NULL);
else if (strcmp(type, "depth") == 0)
honey_texture_new_depth(texture, width, height, NULL);
else {
char* error;
honey_format_string(&error,
"unknown texture type '%s'",
type);
lua_pushstring(L, error);
free(error);
lua_error(L);
}
return 0;
}
static int honey_lua_texture_load(lua_State* L)
{
honey_texture* texture;
char* texture_path;
honey_lua_parse_arguments(L, 3,
HONEY_USERDATA, &texture,
HONEY_STRING, &texture_path);
enum honey_texture_result result = honey_texture_load(texture, texture_path);
if (result != TEXTURE_OK) {
char* error;
honey_format_string(&error,
"failed to load '%s'",
texture_path);
lua_pushstring(L, error);
free(error);
lua_error(L);
}
return 0;
}
static int honey_lua_texture_use(lua_State* L)
{
honey_texture* texture;
int texture_unit;
honey_lua_parse_arguments(L, 2,
HONEY_USERDATA, &texture,
HONEY_INTEGER, &texture_unit);
honey_texture_use(*texture, texture_unit);
return 0;
}
static int honey_lua_framebuffer_new(lua_State* L)
{
honey_texture* draw, *depth;
if (lua_isuserdata(L, 1))
draw = lua_touserdata(L, 1);
else
draw = NULL;
if (lua_isuserdata(L, 2))
depth = lua_touserdata(L, 2);
else
depth = NULL;
int width, height;
honey_lua_parse_arguments(L, 4, HONEY_ANY, HONEY_ANY,
HONEY_INTEGER, &width,
HONEY_INTEGER, &height);
unsigned int framebuffer;
honey_texture_framebuffer_object_new(&framebuffer,
draw, depth,
width, height);
lua_pushinteger(L, framebuffer);
return 1;
}
void honey_setup_texture(lua_State* L)
{
honey_lua_element texture_elements[] = {
{ "new", HONEY_FUNCTION, { .function = honey_lua_texture_new } },
{ "new_framebuffer", HONEY_FUNCTION, { .function = honey_lua_framebuffer_new } },
{ "create", HONEY_FUNCTION, { .function = honey_lua_texture_create } },
{ "load", HONEY_FUNCTION, { .function = honey_lua_texture_load } },
{ "use", HONEY_FUNCTION, { .function = honey_lua_texture_use } },
};
honey_lua_create_table(L, texture_elements, 5);
}
/* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ */
static void generate_texture(honey_texture* texture,
int width, int height,
int format, int type,
void* data)
{
unsigned int texture_id;
glGenTextures(1, &texture_id);
glBindTexture(GL_TEXTURE_2D, texture_id);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexImage2D(GL_TEXTURE_2D, 0,
format,
width, height, 0,
format,
type, data);
texture->id = texture_id;
texture->width = width;
texture->height = height;
switch(format) {
case GL_RED:
texture->type = GREY;
texture->channels = 1;
break;
case GL_RGB:
texture->type = RGB;
texture->channels = 3;
break;
case GL_RGBA:
texture->type = RGBA;
texture->channels = 4;
break;
case GL_DEPTH_COMPONENT:
texture->type = DEPTH;
texture->channels = 1;
break;
default:
break;
}
return HONEY_OK;
}
/* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ */
void honey_texture_new_greyscale(honey_texture* texture,
int height, int width,
unsigned char* data)
{
generate_texture(texture, width, height, GL_RED, GL_UNSIGNED_BYTE, data);
}
/* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ */
void honey_texture_new_rgb(honey_texture* texture,
int height, int width,
unsigned char* data)
{
generate_texture(texture, width, height, GL_RGB, GL_UNSIGNED_BYTE, data);
}
/* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ */
void honey_texture_new_rgba(honey_texture* texture,
int height, int width,
unsigned char* data)
{
generate_texture(texture, width, height, GL_RGBA, GL_UNSIGNED_BYTE, data);
}
/* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ */
void honey_texture_new_depth(honey_texture* texture,
int height, int width,
float* data)
{
generate_texture(texture, width, height, GL_DEPTH_COMPONENT, GL_FLOAT, data);
}
/* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ */
enum honey_texture_result honey_texture_load(honey_texture* texture,
char* texture_path)
{
int width, height, channels;
unsigned char* image_data = stbi_load(texture_path, &width, &height, &channels, 0);
if (image_data == NULL) {
return TEXTURE_FAILED;
}
switch(channels) {
case 1:
honey_texture_new_greyscale(texture, width, height, image_data);
break;
case 3:
honey_texture_new_rgb(texture, width, height, image_data);
break;
case 4:
honey_texture_new_rgba(texture, width, height, image_data);
break;
default:
return TEXTURE_CHANNEL_ERROR;
}
glGenerateMipmap(GL_TEXTURE_2D);
stbi_image_free(image_data);
return TEXTURE_OK;
}
/* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ */
void honey_texture_use(honey_texture texture, int texture_unit) {
glActiveTexture(GL_TEXTURE0 + texture_unit);
glBindTexture(GL_TEXTURE_2D, texture.id);
}
/* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ */
void honey_texture_framebuffer_object_new(unsigned int* destination,
honey_texture* draw,
honey_texture* depth,
int width, int height)
{
glGenFramebuffers(1, destination);
glBindFramebuffer(GL_FRAMEBUFFER, *destination);
if (draw != NULL)
glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, draw->id, 0);
else {
glDrawBuffer(GL_NONE);
glReadBuffer(GL_NONE);
}
if (depth != NULL)
glFramebufferTexture2D(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_TEXTURE_2D, depth->id, 0);
if (glCheckFramebufferStatus(GL_FRAMEBUFFER) != GL_FRAMEBUFFER_COMPLETE)
printf("framebuffer is not complete!\n");
glBindFramebuffer(GL_FRAMEBUFFER, 0);
}
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